BNC 835-3 User Manual - Manual (Page 20)

Figure 12 MODULATION tab for frequency and phase modulation
Reference
The 835-3 can be locked to an external frequency reference by connecting to the
external reference input in the rear panel. To enable the external reference, go to the
REFERENCE tab (Figure 13). Click Use ext. reference and enter the reference
frequency. The reference frequency must be an integer multiple of 1 MHz. The maximum
frequency is 100 MHz. Enter the reference frequency as appropriate. The lock status is
shown as Locked (green color) or Not Locked (red color). Note that if phase lock is not
achieved, the applied external reference frequency deviates by more the +/- 1.0 ppm
from the entered reference frequency. Make sure that your reference has the required
accuracy.
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